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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	naveen.n.rao@linux.vnet.ibm.com
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
	linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v2 06/25] powerpc/ftrace: Inline ftrace_modify_code()
Date: Sat,  7 May 2022 08:46:08 +0200	[thread overview]
Message-ID: <1597a06d57cfc80e6853838c4066e799bf6c7977.1651905939.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1651905939.git.christophe.leroy@csgroup.eu>

Inlining ftrace_modify_code(), it increases a bit the
size of ftrace code but brings 5% improvment on ftrace
activation.

Usually in C files we let gcc decide what to do but here
it really help to 'help' gcc to decide to inline, thought
we don't want to force it with an __always_inline that
would be too much for CONFIG_CC_OPTIMIZE_FOR_SIZE.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
v2: More explanation in commit message
---
 arch/powerpc/kernel/trace/ftrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index 41c45b9c7f39..98e82fa4980f 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -53,7 +53,7 @@ ftrace_call_replace(unsigned long ip, unsigned long addr, int link)
 	return op;
 }
 
-static int
+static inline int
 ftrace_modify_code(unsigned long ip, ppc_inst_t old, ppc_inst_t new)
 {
 	ppc_inst_t replaced;
-- 
2.35.1


  parent reply	other threads:[~2022-05-07  6:48 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-07  6:46 [PATCH v2 00/25] powerpc: ftrace optimisation and cleanup and more [v2] Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 01/25] powerpc/ftrace: Refactor prepare_ftrace_return() Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 02/25] powerpc/ftrace: Remove redundant create_branch() calls Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 03/25] powerpc/code-patching: Inline is_offset_in_{cond}_branch_range() Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 04/25] powerpc/ftrace: Use is_offset_in_branch_range() Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 05/25] powerpc/code-patching: Inline create_branch() Christophe Leroy
2022-05-07  6:46 ` Christophe Leroy [this message]
2022-05-07  6:46 ` [PATCH v2 07/25] powerpc/ftrace: Use patch_instruction() return directly Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 08/25] powerpc: Add CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI_V2 Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 09/25] powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2} Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 10/25] powerpc: Finalise cleanup around ABI use Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 11/25] powerpc/ftrace: Make __ftrace_make_{nop/call}() common to PPC32 and PPC64 Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 12/25] powerpc/ftrace: Don't include ftrace.o for CONFIG_FTRACE_SYSCALLS Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 13/25] powerpc/ftrace: Use CONFIG_FUNCTION_TRACER instead of CONFIG_DYNAMIC_FTRACE Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 14/25] powerpc/ftrace: Remove ftrace_plt_tramps[] Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 15/25] powerpc/ftrace: Use BRANCH_SET_LINK instead of value 1 Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 16/25] powerpc/ftrace: Use PPC_RAW_xxx() macros instead of opencoding Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 17/25] powerpc/ftrace: Use size macro " Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 18/25] powerpc/ftrace: Simplify expected_nop_sequence() Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 19/25] powerpc/ftrace: Minimise number of #ifdefs Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 20/25] powerpc/inst: Add __copy_inst_from_kernel_nofault() Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 21/25] powerpc/ftrace: Don't use copy_from_kernel_nofault() in module_trampoline_target() Christophe Leroy
2022-05-07 11:29   ` kernel test robot
2022-05-07  6:46 ` [PATCH v2 22/25] powerpc/inst: Remove PPC_INST_BRANCH Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 23/25] powerpc/modules: Use PPC_LI macros instead of opencoding Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 24/25] powerpc/inst: Remove PPC_INST_BL Christophe Leroy
2022-05-07  6:46 ` [PATCH v2 25/25] powerpc/opcodes: Remove unused PPC_INST_XXX macros Christophe Leroy

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