The patch titled nommu: correct kobjsize() page validity checks. has been removed from the -mm tree. Its filename was nommu-correct-kobjsize-page-validity-checks.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: nommu: correct kobjsize() page validity checks. From: Paul Mundt <lethal@xxxxxxxxxxxx> This implements a few changes on top of the recent kobjsize() refactoring introduced by commit 6cfd53fc03670c7a544a56d441eb1a6cc800d72b Author: Paul Mundt <lethal@xxxxxxxxxxxx> Date: Thu Jun 5 22:46:08 2008 -0700 nommu: fix kobjsize() for SLOB and SLUB As Christoph points out: virt_to_head_page cannot return NULL. virt_to_page also does not return NULL. pfn_valid() needs to be used to figure out if a page is valid. Otherwise the page struct reference that was returned may have PageReserved() set to indicate that it is not a valid page. As discussed further in the thread, virt_addr_valid() is the preferable way to validate the object pointer in this case. In addition to fixing up the reserved page case, it also has the benefit of encapsulating the hack introduced by commit 4016a1390d07f15b267eecb20e76a48fd5c524ef on the impacted platforms, allowing us to get rid of the extra checking in kobjsize() for the platforms that don't perform this type of bizarre memory_end abuse (every nommu platform that isn't blackfin). If blackfin decides to get in line with every other platform and use PageReserved for the DMA pages in question, kobjsize() will also continue to work fine. It also turns out that compound_order() will give us back 0-order for non-head pages, so we can get rid of the PageCompound check and just use compound_order() directly. Clean that up while we're at it. Signed-off-by: Paul Mundt <lethal@xxxxxxxxxxxx> Reviewed-by: Christoph Lameter <clameter@xxxxxxx> Cc: Bryan Wu <cooloney@xxxxxxxxxx> Cc: David Howells <dhowells@xxxxxxxxxx> Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/nommu.c | 21 +++------------------ 1 file changed, 3 insertions(+), 18 deletions(-) diff -puN mm/nommu.c~nommu-correct-kobjsize-page-validity-checks mm/nommu.c --- a/mm/nommu.c~nommu-correct-kobjsize-page-validity-checks +++ a/mm/nommu.c @@ -104,21 +104,15 @@ EXPORT_SYMBOL(vmtruncate); unsigned int kobjsize(const void *objp) { struct page *page; - int order = 0; /* * If the object we have should not have ksize performed on it, * return size of 0 */ - if (!objp) - return 0; - - if ((unsigned long)objp >= memory_end) + if (!objp || !virt_addr_valid(objp)) return 0; page = virt_to_head_page(objp); - if (!page) - return 0; /* * If the allocator sets PageSlab, we know the pointer came from @@ -129,18 +123,9 @@ unsigned int kobjsize(const void *objp) /* * The ksize() function is only guaranteed to work for pointers - * returned by kmalloc(). So handle arbitrary pointers, that we expect - * always to be compound pages, here. - */ - if (PageCompound(page)) - order = compound_order(page); - - /* - * Finally, handle arbitrary pointers that don't set PageSlab. - * Default to 0-order in the case when we're unable to ksize() - * the object. + * returned by kmalloc(). So handle arbitrary pointers here. */ - return PAGE_SIZE << order; + return PAGE_SIZE << compound_order(page); } /* _ Patches currently in -mm which might be from lethal@xxxxxxxxxxxx are origin.patch linux-next.patch add-have_clk-to-kconfig-for-driver-dependencies.patch i2c-renesas-highlander-fpga-smbus-support.patch maple-allow-removal-and-reinsertion-of-keyboard-driver-module.patch smc911x-remove-unused-8-bit-i-o-operations.patch smc911x-fix-16-bit-i-o-operations.patch smc911x-pass-along-private-data-and-use-iomem.patch smc911x-introduce-platform-data-flags.patch smc911x-superh-architecture-support.patch net-sh_eth-add-support-for-renesas-superh-ethernet.patch mm-move-bootmem-descriptors-definition-to-a-single-place.patch mm-remove-double-indirection-on-tlb-parameter-to-free_pgd_range-co.patch lib-taint-kernel-in-common-report_bug-warn-path.patch rtc-rtc-rs5c372-smbus-conversion-support.patch rtc-rtc-rs5c732-add-support-for-ricoh-r2025s-d-rtc.patch video-superh-mobile-lcdc-driver.patch video-superh-mobile-lcdc-driver-update.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html