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mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 

Since commit 4064b98270 ("mm: allow VM_FAULT_RETRY for multiple
times") allowed VM_FAULT_RETRY for multiple times, the
FAULT_FLAG_ALLOW_RETRY bit of fault_flag will not be changed in the page
fault path, so the following check is no longer needed:

	flags & FAULT_FLAG_ALLOW_RETRY

So just remove it.

[akpm@linux-foundation.org: coding style fixes]

Link: https://lkml.kernel.org/r/20211110123358.36511-1-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kirill Shutemov <kirill@shutemov.name>
Cc: Peter Xu <peterx@redhat.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Qi Zheng 2022-01-14 14:05:51 -08:00 committed by Linus Torvalds
parent 2c769ed713
commit 36ef159f44
22 changed files with 128 additions and 162 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/mm/fault.c
View File

@ -165,7 +165,6 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -176,7 +175,6 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
goto retry;
}
}
mmap_read_unlock(mm);

3
arch/arc/mm/fault.c
View File

@ -149,8 +149,7 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
/*
* Fault retry nuances, mmap_lock already relinquished by core mm
*/
if (unlikely((fault & VM_FAULT_RETRY) &&
(flags & FAULT_FLAG_ALLOW_RETRY))) {
if (unlikely(fault & VM_FAULT_RETRY)) {
flags |= FAULT_FLAG_TRIED;
goto retry;
}

2
arch/arm/mm/fault.c
View File

@ -312,7 +312,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
return 0;
}
if (!(fault & VM_FAULT_ERROR) && flags & FAULT_FLAG_ALLOW_RETRY) {
if (!(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
goto retry;

2
arch/arm64/mm/fault.c
View File

@ -606,11 +606,9 @@ static int __kprobes do_page_fault(unsigned long far, unsigned int esr,
}
if (fault & VM_FAULT_RETRY) {
if (mm_flags & FAULT_FLAG_ALLOW_RETRY) {
mm_flags |= FAULT_FLAG_TRIED;
goto retry;
}
}
mmap_read_unlock(mm);
/*

2
arch/hexagon/mm/vm_fault.c
View File

@ -98,12 +98,10 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)
/* The most common case -- we are done. */
if (likely(!(fault & VM_FAULT_ERROR))) {
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/ia64/mm/fault.c
View File

@ -156,7 +156,6 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -167,7 +166,6 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/m68k/mm/fault.c
View File

@ -153,7 +153,6 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -165,7 +164,6 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
goto retry;
}
}
mmap_read_unlock(mm);
return 0;

2
arch/microblaze/mm/fault.c
View File

@ -232,7 +232,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -244,7 +243,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
goto retry;
}
}
mmap_read_unlock(mm);

3
arch/mips/mm/fault.c
View File

@ -171,7 +171,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
goto do_sigbus;
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -183,7 +183,6 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/nds32/mm/fault.c
View File

@ -230,7 +230,6 @@ void do_page_fault(unsigned long entry, unsigned long addr,
goto bad_area;
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -240,7 +239,6 @@ void do_page_fault(unsigned long entry, unsigned long addr,
*/
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/nios2/mm/fault.c
View File

@ -149,7 +149,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long cause,
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -161,7 +160,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long cause,
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/openrisc/mm/fault.c
View File

@ -177,7 +177,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
/*RGD modeled on Cris */
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -189,7 +188,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/parisc/mm/fault.c
View File

@ -324,7 +324,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
goto bad_area;
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
/*
* No need to mmap_read_unlock(mm) as we would
@ -334,7 +333,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
flags |= FAULT_FLAG_TRIED;
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/powerpc/mm/fault.c
View File

@ -516,11 +516,9 @@ static int ___do_page_fault(struct pt_regs *regs, unsigned long address,
* case.
*/
if (unlikely(fault & VM_FAULT_RETRY)) {
if (flags & FAULT_FLAG_ALLOW_RETRY) {
flags |= FAULT_FLAG_TRIED;
goto retry;
}
}
mmap_read_unlock(current->mm);

2
arch/riscv/mm/fault.c
View File

@ -330,7 +330,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
if (fault_signal_pending(fault, regs))
return;
if (unlikely((fault & VM_FAULT_RETRY) && (flags & FAULT_FLAG_ALLOW_RETRY))) {
if (unlikely(fault & VM_FAULT_RETRY)) {
flags |= FAULT_FLAG_TRIED;
/*

8
arch/s390/mm/fault.c
View File

@ -452,12 +452,13 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access)
if (unlikely(fault & VM_FAULT_ERROR))
goto out_up;
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
if (IS_ENABLED(CONFIG_PGSTE) && gmap &&
(flags & FAULT_FLAG_RETRY_NOWAIT)) {
/* FAULT_FLAG_RETRY_NOWAIT has been set,
* mmap_lock has not been released */
/*
* FAULT_FLAG_RETRY_NOWAIT has been set, mmap_lock has
* not been released
*/
current->thread.gmap_pfault = 1;
fault = VM_FAULT_PFAULT;
goto out_up;
@ -467,7 +468,6 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access)
mmap_read_lock(mm);
goto retry;
}
}
if (IS_ENABLED(CONFIG_PGSTE) && gmap) {
address = __gmap_link(gmap, current->thread.gmap_addr,
address);

2
arch/sh/mm/fault.c
View File

@ -485,7 +485,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
if (mm_fault_error(regs, error_code, address, fault))
return;
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -496,7 +495,6 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
*/
goto retry;
}
}
mmap_read_unlock(mm);
}

2
arch/sparc/mm/fault_32.c
View File

@ -200,7 +200,6 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -211,7 +210,6 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
goto retry;
}
}
mmap_read_unlock(mm);
return;

2
arch/sparc/mm/fault_64.c
View File

@ -437,7 +437,6 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -448,7 +447,6 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
goto retry;
}
}
mmap_read_unlock(mm);
mm_rss = get_mm_rss(mm);

2
arch/um/kernel/trap.c
View File

@ -87,13 +87,11 @@ int handle_page_fault(unsigned long address, unsigned long ip,
}
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
goto retry;
}
}
pmd = pmd_off(mm, address);
pte = pte_offset_kernel(pmd, address);

3
arch/x86/mm/fault.c
View File

@ -1413,8 +1413,7 @@ void do_user_addr_fault(struct pt_regs *regs,
* and if there is a fatal signal pending there is no guarantee
* that we made any progress. Handle this case first.
*/
if (unlikely((fault & VM_FAULT_RETRY) &&
(flags & FAULT_FLAG_ALLOW_RETRY))) {
if (unlikely(fault & VM_FAULT_RETRY)) {
flags |= FAULT_FLAG_TRIED;
goto retry;
}

3
arch/xtensa/mm/fault.c
View File

@ -127,7 +127,7 @@ void do_page_fault(struct pt_regs *regs)
goto do_sigbus;
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_RETRY) {
flags |= FAULT_FLAG_TRIED;
@ -138,7 +138,6 @@ void do_page_fault(struct pt_regs *regs)
goto retry;
}
}
mmap_read_unlock(mm);
return;