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Message-Id: <20200416115118.808485515@infradead.org>
Date: Thu, 16 Apr 2020 13:47:11 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: tglx@...utronix.de, jpoimboe@...hat.com
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, peterz@...radead.org,
mhiramat@...nel.org, mbenes@...e.cz, jthierry@...hat.com,
alexandre.chartre@...cle.com
Subject: [PATCH v5 05/17] x86,ftrace: Use SIZEOF_PTREGS
There's a convenient macro for 'SS+8' called FRAME_SIZE. Use it to
clarify things.
(entry/calling.h calls this SIZEOF_PTREGS but we're using
asm/ptrace-abi.h)
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
arch/x86/kernel/ftrace_64.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/kernel/ftrace_64.S
+++ b/arch/x86/kernel/ftrace_64.S
@@ -23,7 +23,7 @@
#endif /* CONFIG_FRAME_POINTER */
/* Size of stack used to save mcount regs in save_mcount_regs */
-#define MCOUNT_REG_SIZE (SS+8 + MCOUNT_FRAME_SIZE)
+#define MCOUNT_REG_SIZE (FRAME_SIZE + MCOUNT_FRAME_SIZE)
/*
* gcc -pg option adds a call to 'mcount' in most functions.
@@ -77,7 +77,7 @@
/*
* We add enough stack to save all regs.
*/
- subq $(MCOUNT_REG_SIZE - MCOUNT_FRAME_SIZE), %rsp
+ subq $(FRAME_SIZE), %rsp
movq %rax, RAX(%rsp)
movq %rcx, RCX(%rsp)
movq %rdx, RDX(%rsp)
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