From mboxrd@z Thu Jan 1 00:00:00 1970 From: linux@arm.linux.org.uk (Russell King - ARM Linux) Date: Mon, 25 Oct 2010 16:13:19 +0100 Subject: cmpxchg() in recent kernels In-Reply-To: References: <4CB036B7.7000100@gai.ru> <20101024214338.GB878@boggieman.bredbandsbolaget.se> <20101024220846.GA6041@n2100.arm.linux.org.uk> Message-ID: <20101025151319.GA21105@n2100.arm.linux.org.uk> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Oct 25, 2010 at 12:33:49PM +1100, Aras Vaichas wrote: > On 25 October 2010 09:08, Russell King - ARM Linux > wrote: > > > > On Sun, Oct 24, 2010 at 11:43:38PM +0200, Kristoffer Ericson wrote: > > > Im seeing something similiar, using GCC 3.4.5 > > > ARM HP Jornada 720, 2.6.36 > snip ... > > > kernel/built-in.o(.text+0x1d038): In function `alloc_pid': > > > include/asm-generic/cmpxchg-local.h:42: undefined reference to `wrong_size_cmpxchg' > > > make: *** [.tmp_vmlinux1] Error 1 > > > > Probably needs to be bisected, but I think in the long run we'll have > > to accept that gcc 4 will become the minimum compiler version. > > I just tested a build with GCC 4.2.3 and it linked correctly. The only > problem is that the kernel image size is now 3x as big. > > > Using gcc-3.4.4-glibc-2.3.5: > > * fails to link without patch to cmpxchg-local.h, but size is similar > to my previous builds > > Created: Mon Oct 25 11:59:04 2010 > Image Type: ARM Linux Kernel Image (gzip compressed) > Data Size: 1471354 Bytes = 1436.87 kB = 1.40 MB > > > Using gcc-4.2.3-glibc-2.7: > > * compiles and links correctly, but size is way too big > > Created: Mon Oct 25 11:48:26 2010 > Image Type: ARM Linux Kernel Image (gzip compressed) > Data Size: 4576155 Bytes = 4468.90 kB = 4.36 MB This sounds like a regression - can you please bisect to try and find which change caused tihs?