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![]() fs_initcall is definitely too late to initialize DMA-debug hash tables, because some drivers might get probed and use DMA mapping framework already in core_initcall. Late initialization of DMA-debug results in false warning about accessing memory, that was not allocated, like this one: ------------[ cut here ]------------ WARNING: CPU: 5 PID: 1 at lib/dma-debug.c:1104 check_unmap+0xa1c/0xe50 exynos-sysmmu 10a60000.sysmmu: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x000000006ebd0000] [size=16384 bytes] Modules linked in: CPU: 5 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc5-00028-g39dde3d-dirty #44 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [<c0119dd4>] (unwind_backtrace) from [<c01122bc>] (show_stack+0x20/0x24) [<c01122bc>] (show_stack) from [<c062714c>] (dump_stack+0x84/0xa0) [<c062714c>] (dump_stack) from [<c0132560>] (__warn+0x14c/0x180) [<c0132560>] (__warn) from [<c01325dc>] (warn_slowpath_fmt+0x48/0x50) [<c01325dc>] (warn_slowpath_fmt) from [<c06814f8>] (check_unmap+0xa1c/0xe50) [<c06814f8>] (check_unmap) from [<c06819c4>] (debug_dma_unmap_page+0x98/0xc8) [<c06819c4>] (debug_dma_unmap_page) from [<c076c3e8>] (exynos_iommu_domain_free+0x158/0x380) [<c076c3e8>] (exynos_iommu_domain_free) from [<c0764a30>] (iommu_domain_free+0x34/0x60) [<c0764a30>] (iommu_domain_free) from [<c011f168>] (release_iommu_mapping+0x30/0xb8) [<c011f168>] (release_iommu_mapping) from [<c011f23c>] (arm_iommu_release_mapping+0x4c/0x50) [<c011f23c>] (arm_iommu_release_mapping) from [<c0b061ac>] (s5p_mfc_probe+0x640/0x80c) [<c0b061ac>] (s5p_mfc_probe) from [<c07e6750>] (platform_drv_probe+0x70/0x148) [<c07e6750>] (platform_drv_probe) from [<c07e25c0>] (driver_probe_device+0x12c/0x6b0) [<c07e25c0>] (driver_probe_device) from [<c07e2c6c>] (__driver_attach+0x128/0x17c) [<c07e2c6c>] (__driver_attach) from [<c07df74c>] (bus_for_each_dev+0x88/0xc8) [<c07df74c>] (bus_for_each_dev) from [<c07e1b6c>] (driver_attach+0x34/0x58) [<c07e1b6c>] (driver_attach) from [<c07e1350>] (bus_add_driver+0x18c/0x32c) [<c07e1350>] (bus_add_driver) from [<c07e4198>] (driver_register+0x98/0x148) [<c07e4198>] (driver_register) from [<c07e5cb0>] (__platform_driver_register+0x58/0x74) [<c07e5cb0>] (__platform_driver_register) from [<c174cb30>] (s5p_mfc_driver_init+0x1c/0x20) [<c174cb30>] (s5p_mfc_driver_init) from [<c0102690>] (do_one_initcall+0x64/0x258) [<c0102690>] (do_one_initcall) from [<c17014c0>] (kernel_init_freeable+0x3d0/0x4d0) [<c17014c0>] (kernel_init_freeable) from [<c116eeb4>] (kernel_init+0x18/0x134) [<c116eeb4>] (kernel_init) from [<c010bbd8>] (ret_from_fork+0x14/0x3c) ---[ end trace dc54c54bd3581296 ]--- This patch moves initialization of DMA-debug to core_initcall. This is safe from the initialization perspective. dma_debug_do_init() internally calls debugfs functions and debugfs also gets initialised at core_initcall(), and that is earlier than arch code in the link order, so it will get initialized just before the DMA-debug. Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> |
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.. | ||
abort-ev4.S | ||
abort-ev4t.S | ||
abort-ev5t.S | ||
abort-ev5tj.S | ||
abort-ev6.S | ||
abort-ev7.S | ||
abort-lv4t.S | ||
abort-macro.S | ||
abort-nommu.S | ||
alignment.c | ||
cache-aurora-l2.h | ||
cache-fa.S | ||
cache-feroceon-l2.c | ||
cache-l2x0-pmu.c | ||
cache-l2x0.c | ||
cache-nop.S | ||
cache-tauros2.c | ||
cache-tauros3.h | ||
cache-uniphier.c | ||
cache-v4.S | ||
cache-v4wb.S | ||
cache-v4wt.S | ||
cache-v6.S | ||
cache-v7.S | ||
cache-v7m.S | ||
cache-xsc3l2.c | ||
context.c | ||
copypage-fa.c | ||
copypage-feroceon.c | ||
copypage-v4mc.c | ||
copypage-v4wb.c | ||
copypage-v4wt.c | ||
copypage-v6.c | ||
copypage-xsc3.c | ||
copypage-xscale.c | ||
dma-mapping.c | ||
dma.h | ||
dump.c | ||
extable.c | ||
fault-armv.c | ||
fault.c | ||
fault.h | ||
flush.c | ||
fsr-2level.c | ||
fsr-3level.c | ||
highmem.c | ||
hugetlbpage.c | ||
idmap.c | ||
init.c | ||
iomap.c | ||
ioremap.c | ||
Kconfig | ||
l2c-common.c | ||
l2c-l2x0-resume.S | ||
Makefile | ||
mm.h | ||
mmap.c | ||
mmu.c | ||
nommu.c | ||
pabort-legacy.S | ||
pabort-v6.S | ||
pabort-v7.S | ||
pageattr.c | ||
pgd.c | ||
proc-arm7tdmi.S | ||
proc-arm9tdmi.S | ||
proc-arm720.S | ||
proc-arm740.S | ||
proc-arm920.S | ||
proc-arm922.S | ||
proc-arm925.S | ||
proc-arm926.S | ||
proc-arm940.S | ||
proc-arm946.S | ||
proc-arm1020.S | ||
proc-arm1020e.S | ||
proc-arm1022.S | ||
proc-arm1026.S | ||
proc-fa526.S | ||
proc-feroceon.S | ||
proc-macros.S | ||
proc-mohawk.S | ||
proc-sa110.S | ||
proc-sa1100.S | ||
proc-syms.c | ||
proc-v6.S | ||
proc-v7-2level.S | ||
proc-v7-3level.S | ||
proc-v7.S | ||
proc-v7m.S | ||
proc-xsc3.S | ||
proc-xscale.S | ||
pv-fixup-asm.S | ||
tcm.h | ||
tlb-fa.S | ||
tlb-v4.S | ||
tlb-v4wb.S | ||
tlb-v4wbi.S | ||
tlb-v6.S | ||
tlb-v7.S |