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arm64: ftrace: fix building without CONFIG_MODULES 

When CONFIG_MODULES is disabled, we cannot dereference a module pointer:

arch/arm64/kernel/ftrace.c: In function 'ftrace_make_call':
arch/arm64/kernel/ftrace.c:107:36: error: dereferencing pointer to incomplete type 'struct module'
   trampoline = (unsigned long *)mod->arch.ftrace_trampoline;

Also, the within_module() function is not defined:

arch/arm64/kernel/ftrace.c: In function 'ftrace_make_nop':
arch/arm64/kernel/ftrace.c:171:8: error: implicit declaration of function 'within_module'; did you mean 'init_module'? [-Werror=implicit-function-declaration]

This addresses both by adding replacing the IS_ENABLED(CONFIG_ARM64_MODULE_PLTS)
checks with #ifdef versions.

Fixes: e71a4e1beb ("arm64: ftrace: add support for far branches to dynamic ftrace")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2017-06-12 14:43:25 +01:00
parent 1eb34b6e51
commit 687644209a
1 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/arm64/kernel/ftrace.c
View File

@ -71,11 +71,12 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
unsigned long pc = rec->ip;
long offset = (long)pc - (long)addr;
u32 old, new;
if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&
(offset < -SZ_128M || offset >= SZ_128M)) {
#ifdef CONFIG_ARM64_MODULE_PLTS
long offset = (long)pc - (long)addr;
if (offset < -SZ_128M || offset >= SZ_128M) {
unsigned long *trampoline;
struct module *mod;
@ -121,6 +122,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
}
addr = (unsigned long)&trampoline[1];
}
#endif /* CONFIG_ARM64_MODULE_PLTS */
old = aarch64_insn_gen_nop();
new = aarch64_insn_gen_branch_imm(pc, addr, AARCH64_INSN_BRANCH_LINK);
@ -135,12 +137,13 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
unsigned long addr)
{
unsigned long pc = rec->ip;
long offset = (long)pc - (long)addr;
bool validate = true;
u32 old = 0, new;
if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&
(offset < -SZ_128M || offset >= SZ_128M)) {
#ifdef CONFIG_ARM64_MODULE_PLTS
long offset = (long)pc - (long)addr;
if (offset < -SZ_128M || offset >= SZ_128M) {
u32 replaced;
/*
@ -177,6 +180,7 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
old = aarch64_insn_gen_branch_imm(pc, addr,
AARCH64_INSN_BRANCH_LINK);
}
#endif /* CONFIG_ARM64_MODULE_PLTS */
new = aarch64_insn_gen_nop();