linux-kernel - [PATCH] 2.6.22.6 user-mode linux: fix error in check

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Message-ID: <20070923122653.GA17386@router.lepton.home>
Date:	Sun, 23 Sep 2007 20:26:53 +0800
From:	lepton <ytht.net@...il.com>
To:	jdike@...aya.com
Cc:	lkm <linux-kernel@...r.kernel.org>
Subject: [PATCH] 2.6.22.6 user-mode linux: fix error in check_sysemu

  it is a error do count++ here, it will let the following compare (after 8 lines)   " if (!count)" always be false.

Signed-off-by: Lepton Wu <ytht.net@...il.com>

diff -X linux-2.6.22.6/Documentation/dontdiff -pr -U 8 linux-2.6.22.6/arch/um/os-Linux/start_up.c linux-2.6.22.6-uml/arch/um/os-Linux/start_up.c
--- linux-2.6.22.6/arch/um/os-Linux/start_up.c	2007-09-14 17:41:10.000000000 +0800
+++ linux-2.6.22.6-uml/arch/um/os-Linux/start_up.c	2007-09-23 20:14:08.000000000 +0800
@@ -250,17 +250,16 @@ static void __init check_sysemu(void)
 	non_fatal("Checking advanced syscall emulation patch for ptrace...");
 	pid = start_ptraced_child(&stack);
 
 	if((ptrace(PTRACE_OLDSETOPTIONS, pid, 0,
 		   (void *) PTRACE_O_TRACESYSGOOD) < 0))
 		fatal_perror("check_ptrace: PTRACE_OLDSETOPTIONS failed");
 
 	while(1){
-		count++;
 		if(ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
 			goto fail;
 		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
 		if(n < 0)
 			fatal_perror("check_ptrace : wait failed");
 
 		if(WIFSTOPPED(status) && (WSTOPSIG(status) == (SIGTRAP|0x80))){
 			if (!count)
-
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