From aa1a64ee12ae130706f3fc0007841ce9b0ddf9c2 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Mon, 21 Nov 2005 21:32:10 -0800 Subject: [PATCH] [PATCH] uml: eliminate use of libc PAGE_SIZE On some systems, libc PAGE_SIZE calls getpagesize, which can't happen from a stub. So, I use UM_KERN_PAGE_SIZE, which is less variable in its definition, instead. Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/skas/clone.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c index 39c0d7145d..cb37ce9124 100644 --- a/arch/um/kernel/skas/clone.c +++ b/arch/um/kernel/skas/clone.c @@ -9,9 +9,13 @@ #include "stub-data.h" #include "uml-config.h" #include "sysdep/stub.h" +#include "kern_constants.h" /* This is in a separate file because it needs to be compiled with any * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled + * + * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize + * on some systems. */ #define STUB_DATA(field) (((struct stub_data *) UML_CONFIG_STUB_DATA)->field) @@ -22,7 +26,7 @@ stub_clone_handler(void) long err; err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, - UML_CONFIG_STUB_DATA + PAGE_SIZE / 2 - + UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *)); if(err != 0) goto out; @@ -36,9 +40,10 @@ stub_clone_handler(void) if(err) goto out; - err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA, PAGE_SIZE, - PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, - STUB_DATA(fd), STUB_DATA(offset)); + err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA, + UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE, + MAP_FIXED | MAP_SHARED, STUB_DATA(fd), + STUB_DATA(offset)); out: /* save current result. Parent: pid; child: retcode of mmap */ STUB_DATA(err) = err; -- 2.39.5