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authorMark Rutland <mark.rutland@arm.com>2019-10-21 15:05:52 +0100
committerMark Rutland <mark.rutland@arm.com>2019-11-06 14:17:36 +0000
commit7f08ae53a7e3ac2a2f86175226ee19f0117d5b6c (patch)
tree27155262f1099cb2112896df852b8e15a60c8cf6 /arch/arm64
parent3b23e4991fb66f6d152f9055ede271a726ef9f21 (diff)
arm64: ftrace: minimize ifdeffery
Now that we no longer refer to mod->arch.ftrace_trampolines in the body of ftrace_make_call(), we can use IS_ENABLED() rather than ifdeffery, and make the code easier to follow. Likewise in ftrace_make_nop(). Let's do so. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Torsten Duwe <duwe@suse.de> Tested-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Tested-by: Torsten Duwe <duwe@suse.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/kernel/ftrace.c18
1 files changed, 8 insertions, 10 deletions
diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c
index aea652c33a38..8618faa82e6d 100644
--- a/arch/arm64/kernel/ftrace.c
+++ b/arch/arm64/kernel/ftrace.c
@@ -62,18 +62,18 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
return ftrace_modify_code(pc, 0, new, false);
}
-#ifdef CONFIG_ARM64_MODULE_PLTS
static struct plt_entry *get_ftrace_plt(struct module *mod, unsigned long addr)
{
+#ifdef CONFIG_ARM64_MODULE_PLTS
struct plt_entry *plt = mod->arch.ftrace_trampolines;
if (addr == FTRACE_ADDR)
return &plt[FTRACE_PLT_IDX];
if (addr == FTRACE_REGS_ADDR && IS_ENABLED(CONFIG_FTRACE_WITH_REGS))
return &plt[FTRACE_REGS_PLT_IDX];
+#endif
return NULL;
}
-#endif
/*
* Turn on the call to ftrace_caller() in instrumented function
@@ -85,10 +85,12 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
long offset = (long)pc - (long)addr;
if (offset < -SZ_128M || offset >= SZ_128M) {
-#ifdef CONFIG_ARM64_MODULE_PLTS
struct module *mod;
struct plt_entry *plt;
+ if (!IS_ENABLED(CONFIG_ARM64_MODULE_PLTS))
+ return -EINVAL;
+
/*
* On kernels that support module PLTs, the offset between the
* branch instruction and its target may legally exceed the
@@ -113,9 +115,6 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
}
addr = (unsigned long)plt;
-#else /* CONFIG_ARM64_MODULE_PLTS */
- return -EINVAL;
-#endif /* CONFIG_ARM64_MODULE_PLTS */
}
old = aarch64_insn_gen_nop();
@@ -185,9 +184,11 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
long offset = (long)pc - (long)addr;
if (offset < -SZ_128M || offset >= SZ_128M) {
-#ifdef CONFIG_ARM64_MODULE_PLTS
u32 replaced;
+ if (!IS_ENABLED(CONFIG_ARM64_MODULE_PLTS))
+ return -EINVAL;
+
/*
* 'mod' is only set at module load time, but if we end up
* dealing with an out-of-range condition, we can assume it
@@ -218,9 +219,6 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
return -EINVAL;
validate = false;
-#else /* CONFIG_ARM64_MODULE_PLTS */
- return -EINVAL;
-#endif /* CONFIG_ARM64_MODULE_PLTS */
} else {
old = aarch64_insn_gen_branch_imm(pc, addr,
AARCH64_INSN_BRANCH_LINK);