All of lore.kernel.org
 help / color / mirror / Atom feed
From: Alexey Dobriyan <adobriyan@gmail.com>
To: x86@kernel.org
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com,
	linux-kernel@vger.kernel.org, adobriyan@gmail.com
Subject: [PATCH 1/5] x86/alternative: simplify DUMP_BYTES macro
Date: Fri, 11 Mar 2022 17:43:08 +0300	[thread overview]
Message-ID: <20220311144312.88466-1-adobriyan@gmail.com> (raw)

Avoid zero length check with clever whitespace placement in the format
string.

Signed-off-by: Alexey Dobriyan (CloudLinux) <adobriyan@gmail.com>
---
 arch/x86/kernel/alternative.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 5007c3ffe96f..6c9758ee6810 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -66,13 +66,10 @@ do {									\
 	if (unlikely(debug_alternative)) {				\
 		int j;							\
 									\
-		if (!(len))						\
-			break;						\
-									\
 		printk(KERN_DEBUG pr_fmt(fmt), ##args);			\
-		for (j = 0; j < (len) - 1; j++)				\
-			printk(KERN_CONT "%02hhx ", buf[j]);		\
-		printk(KERN_CONT "%02hhx\n", buf[j]);			\
+		for (j = 0; j < (len); j++)				\
+			printk(KERN_CONT " %02hhx", buf[j]);		\
+		printk(KERN_CONT "\n");					\
 	}								\
 } while (0)
 
@@ -214,7 +211,7 @@ static __always_inline int optimize_nops_range(u8 *instr, u8 instrlen, int off)
 	add_nops(instr + off, nnops);
 	local_irq_restore(flags);
 
-	DUMP_BYTES(instr, instrlen, "%px: [%d:%d) optimized NOPs: ", instr, off, i);
+	DUMP_BYTES(instr, instrlen, "%px: [%d:%d) optimized NOPs:", instr, off, i);
 
 	return nnops;
 }
@@ -303,8 +300,8 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start,
 			instr, instr, a->instrlen,
 			replacement, a->replacementlen);
 
-		DUMP_BYTES(instr, a->instrlen, "%px:   old_insn: ", instr);
-		DUMP_BYTES(replacement, a->replacementlen, "%px:   rpl_insn: ", replacement);
+		DUMP_BYTES(instr, a->instrlen, "%px:   old_insn:", instr);
+		DUMP_BYTES(replacement, a->replacementlen, "%px:   rpl_insn:", replacement);
 
 		memcpy(insn_buff, replacement, a->replacementlen);
 		insn_buff_sz = a->replacementlen;
@@ -328,7 +325,7 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start,
 		for (; insn_buff_sz < a->instrlen; insn_buff_sz++)
 			insn_buff[insn_buff_sz] = 0x90;
 
-		DUMP_BYTES(insn_buff, insn_buff_sz, "%px: final_insn: ", instr);
+		DUMP_BYTES(insn_buff, insn_buff_sz, "%px: final_insn:", instr);
 
 		text_poke_early(instr, insn_buff, insn_buff_sz);
 
@@ -499,8 +496,8 @@ void __init_or_module noinline apply_retpolines(s32 *start, s32 *end)
 		len = patch_retpoline(addr, &insn, bytes);
 		if (len == insn.length) {
 			optimize_nops(bytes, len);
-			DUMP_BYTES(((u8*)addr),  len, "%px: orig: ", addr);
-			DUMP_BYTES(((u8*)bytes), len, "%px: repl: ", addr);
+			DUMP_BYTES(((u8*)addr),  len, "%px: orig:", addr);
+			DUMP_BYTES(((u8*)bytes), len, "%px: repl:", addr);
 			text_poke_early(addr, bytes, len);
 		}
 	}
-- 
2.34.1


             reply	other threads:[~2022-03-11 14:43 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-11 14:43 Alexey Dobriyan [this message]
2022-03-11 14:43 ` [PATCH 2/5] x86/alternative: bump MAX_PATCH_LEN Alexey Dobriyan
2022-03-11 14:43 ` [PATCH 3/5] x86/alternative: record .altinstructions section entity size Alexey Dobriyan
2022-03-12 21:17   ` Peter Zijlstra
2022-03-13 18:05     ` Alexey Dobriyan
2022-04-05 19:24       ` Thomas Gleixner
2022-04-06  8:30         ` Rasmus Villemoes
2022-03-11 14:43 ` [PATCH 4/5] x86/alternative: make .altinstr_replacement section non-executable Alexey Dobriyan
2022-03-12 15:31   ` Peter Zijlstra
2022-03-11 14:43 ` [PATCH 5/5] x86/unwind/orc: delete dead write in __orc_find() Alexey Dobriyan
2022-03-11 15:13   ` David Laight
2022-03-11 16:59     ` Alexey Dobriyan
2022-03-12 16:36 ` [PATCH 1/5] x86/alternative: simplify DUMP_BYTES macro Joe Perches
2022-03-13  0:14   ` Joe Perches
2022-03-13 18:09   ` Alexey Dobriyan
2022-03-14  3:21     ` Joe Perches
2022-04-03 22:25 ` Borislav Petkov
2022-04-05 16:36 ` Thomas Gleixner

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220311144312.88466-1-adobriyan@gmail.com \
    --to=adobriyan@gmail.com \
    --cc=bp@alien8.de \
    --cc=dave.hansen@linux.intel.com \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.