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authorTrent Piepho <xyzzy@speakeasy.org>2006-05-15 09:44:06 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-05-15 11:20:55 -0700
commit5e376613899076396d0c97de67ad072587267370 (patch)
treeecc15c25ee4da7754aa7d137dccebab68820399e /mm
parent[PATCH] s390: add vmsplice system call (diff)
downloadlinux-dev-5e376613899076396d0c97de67ad072587267370.tar.xz
linux-dev-5e376613899076396d0c97de67ad072587267370.zip
[PATCH] symbol_put_addr() locks kernel
Even since a previous patch: Fix race between CONFIG_DEBUG_SLABALLOC and modules Sun, 27 Jun 2004 17:55:19 +0000 (17:55 +0000) http://www.kernel.org/git/?p=linux/kernel/git/torvalds/old-2.6-bkcvs.git;a=commit;h=92b3db26d31cf21b70e3c1eadc56c179506d8fbe The function symbol_put_addr() will deadlock the kernel. symbol_put_addr() would acquire modlist_lock, then while holding the lock call two functions kernel_text_address() and module_text_address() which also try to acquire the same lock. This deadlocks the kernel of course. This patch changes symbol_put_addr() to not acquire the modlist_lock, it doesn't need it since it never looks at the module list directly. Also, it now uses core_kernel_text() instead of kernel_text_address(). The latter has an additional check for addr inside a module, but we don't need to do that since we call module_text_address() (the same function kernel_text_address uses) ourselves. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Cc: Zwane Mwaikambo <zwane@fsmlabs.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Johannes Stezenbach <js@linuxtv.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
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