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powerpc/mm: Move out definition of CPU specific is_write bits 

Define a common page_fault_is_write() helper and use it

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2017-07-19 14:49:29 +10:00 committed by Michael Ellerman
parent b4c001dc44
commit 41b464e5e5
1 changed files with 11 additions and 7 deletions
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18
arch/powerpc/mm/fault.c
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@ -182,6 +182,16 @@ static int mm_fault_error(struct pt_regs *regs, unsigned long addr, int fault)
return MM_FAULT_CONTINUE;
}
/*
* Define the correct "is_write" bit in error_code based
* on the processor family
*/
#if (defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
#define page_fault_is_write(__err) ((__err) & ESR_DST)
#else
#define page_fault_is_write(__err) ((__err) & DSISR_ISSTORE)
#endif
/*
* For 600- and 800-family processors, the error_code parameter is DSISR
* for a data fault, SRR1 for an instruction fault. For 400-family processors
@ -202,18 +212,12 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
struct mm_struct *mm = current->mm;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
int code = SEGV_MAPERR;
int is_write = 0;
int is_exec = TRAP(regs) == 0x400;
int is_user = user_mode(regs);
int is_write = page_fault_is_write(error_code);
int fault;
int rc = 0, store_update_sp = 0;
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
is_write = error_code & DSISR_ISSTORE;
#else
is_write = error_code & ESR_DST;
#endif /* CONFIG_4xx || CONFIG_BOOKE */
#ifdef CONFIG_PPC_ICSWX
/*
* we need to do this early because this "data storage