From: Mark Rutland <mark.rutland@arm.com>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: mark.rutland@arm.com, jthierry@redhat.com, will@kernel.org,
ard.biesheuvel@linaro.org, peterz@infradead.org,
catalin.marinas@arm.com, deller@gmx.de, jpoimboe@redhat.com,
rostedt@goodmis.org, takahiro.akashi@linaro.org,
mingo@redhat.com, james.morse@arm.com, jeyu@kernel.org,
amit.kachhap@arm.com, svens@stackframe.org, duwe@suse.de
Subject: [PATCH 8/8] arm64: ftrace: minimize ifdeffery
Date: Mon, 21 Oct 2019 17:34:26 +0100 [thread overview]
Message-ID: <20191021163426.9408-9-mark.rutland@arm.com> (raw)
In-Reply-To: <20191021163426.9408-1-mark.rutland@arm.com>
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>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
---
arch/arm64/kernel/ftrace.c | 18 ++++++++----------
1 file 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);
--
2.11.0
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next prev parent reply other threads:[~2019-10-21 16:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-21 16:34 [PATCH 0/8] arm64: ftrace cleanup + FTRACE_WITH_REGS Mark Rutland
2019-10-21 16:34 ` [PATCH 1/8] ftrace: add ftrace_init_nop() Mark Rutland
2019-10-21 18:07 ` Steven Rostedt
2019-10-22 11:28 ` Mark Rutland
2019-10-22 12:54 ` Steven Rostedt
2019-10-22 15:30 ` Mark Rutland
2019-10-22 15:33 ` Mark Rutland
2019-10-22 16:01 ` Steven Rostedt
2019-10-21 16:34 ` [PATCH 2/8] module/ftrace: handle patchable-function-entry Mark Rutland
2019-10-21 16:34 ` [PATCH 3/8] arm64: module: rework special section handling Mark Rutland
2019-10-21 16:34 ` [PATCH 4/8] arm64: module/ftrace: intialize PLT at load time Mark Rutland
2019-10-21 16:34 ` [PATCH 5/8] arm64: insn: add encoder for MOV (register) Mark Rutland
2019-10-21 16:34 ` [PATCH 6/8] arm64: asm-offsets: add S_FP Mark Rutland
2019-10-21 16:34 ` [PATCH 7/8] arm64: implement ftrace with regs Mark Rutland
2019-10-21 16:34 ` Mark Rutland [this message]
2019-10-24 16:32 ` [PATCH 0/8] arm64: ftrace cleanup + FTRACE_WITH_REGS Ard Biesheuvel
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