From: Paolo 'Blaisorblade' Giarrusso Date: Thu, 14 Jul 2005 07:33:36 +0000 (-0700) Subject: [PATCH] uml: workaround host bug in "TT mode vs. NPTL link fix" X-Git-Tag: v2.6.13-rc4~112 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=1feb8d2d7396748fb3bd6795d09bbfbdd4c03dff;p=linux-2.6-omap-h63xx.git [PATCH] uml: workaround host bug in "TT mode vs. NPTL link fix" A big bug has been diagnosed on hosts running the SKAS patch and built with CONFIG_REGPARM, due to some missing prevent_tail_call(). On these hosts, this workaround is needed to avoid triggering that bug, because "to" is kept by GCC only in EBX, which is corrupted at the return of mmap2(). Since to trigger this bug int 0x80 must be used when doing the call, it rarely manifests itself, so I'd prefer to get this merged to workaround that host bug, since it should cause no functional change. Still, you might prefer to drop it, I'll leave this to you. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Cc: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/um/sys-i386/unmap.c b/arch/um/sys-i386/unmap.c index 136875263d2..1b0ad0e4adc 100644 --- a/arch/um/sys-i386/unmap.c +++ b/arch/um/sys-i386/unmap.c @@ -15,7 +15,7 @@ int switcheroo(int fd, int prot, void *from, void *to, int size) if(munmap(to, size) < 0){ return(-1); } - if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){ + if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){ return(-1); } if(munmap(from, size) < 0){ diff --git a/arch/um/sys-x86_64/unmap.c b/arch/um/sys-x86_64/unmap.c index bc7094cce47..f4a4bffd8a1 100644 --- a/arch/um/sys-x86_64/unmap.c +++ b/arch/um/sys-x86_64/unmap.c @@ -15,7 +15,7 @@ int switcheroo(int fd, int prot, void *from, void *to, int size) if(munmap(to, size) < 0){ return(-1); } - if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){ + if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){ return(-1); } if(munmap(from, size) < 0){