kernel/git/stable/linux.git/arch/Kconfig, branch linux-5.7.y

Merge tag 'dma-mapping-5.7' of git://git.infradead.org/users/hch/dma-mapping

2020-04-04T17:12:47+00:00

Pull dma-mapping updates from Christoph Hellwig: - fix an integer overflow in the coherent pool (Kevin Grandemange) - provide support for in-place uncached remapping and use that for openrisc - fix the arm coherent allocator to take the bus limit into account * tag 'dma-mapping-5.7' of git://git.infradead.org/users/hch/dma-mapping: ARM/dma-mapping: merge __dma_supported into arm_dma_supported ARM/dma-mapping: take the bus limit into account in __dma_alloc ARM/dma-mapping: remove get_coherent_dma_mask openrisc: use the generic in-place uncached DMA allocator dma-direct: provide a arch_dma_clear_uncached hook dma-direct: make uncached_kernel_address more general dma-direct: consolidate the error handling in dma_direct_alloc_pages dma-direct: remove the cached_kernel_address hook dma-coherent: fix integer overflow in the reserved-memory dma allocation

Merge tag 'timers-nohz-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2020-03-31T01:29:05+00:00

Pull NOHZ update from Thomas Gleixner: "Remove TIF_NOHZ from three architectures These architectures use a static key to decide whether context tracking needs to be invoked and the TIF_NOHZ flag just causes a pointless slowpath execution for nothing" * tag 'timers-nohz-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: arm64: Remove TIF_NOHZ arm: Remove TIF_NOHZ x86: Remove TIF_NOHZ context-tracking: Introduce CONFIG_HAVE_TIF_NOHZ x86/entry: Remove _TIF_NOHZ from _TIF_WORK_SYSCALL_ENTRY

dma-direct: provide a arch_dma_clear_uncached hook

2020-03-16T09:48:12+00:00

This allows the arch code to reset the page tables to cached access when freeing a dma coherent allocation that was set to uncached using arch_dma_set_uncached. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy

dma-direct: make uncached_kernel_address more general

2020-03-16T09:48:09+00:00

Rename the symbol to arch_dma_set_uncached, and pass a size to it as well as allow an error return. That will allow reusing this hook for in-place pagetable remapping. As the in-place remap doesn't always require an explicit cache flush, also detangle ARCH_HAS_DMA_PREP_COHERENT from ARCH_HAS_DMA_SET_UNCACHED. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy

dma-direct: remove the cached_kernel_address hook

2020-03-16T09:48:02+00:00

dma-direct now finds the kernel address for coherent allocations based on the dma address, so the cached_kernel_address hooks is unused and can be removed entirely. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy

arch/Kconfig: update HAVE_RELIABLE_STACKTRACE description

2020-03-06T13:06:09+00:00

save_stack_trace_tsk_reliable() is not the only function providing the reliable stack traces anymore. Architecture might define ARCH_STACKWALK which provides a newer stack walking interface and has arch_stack_walk_reliable() function. Update the description accordingly. Signed-off-by: Andrew Morton Signed-off-by: Miroslav Benes Acked-by: Josh Poimboeuf Link: http://lkml.kernel.org/r/20200120154042.9934-1-mbenes@suse.cz Signed-off-by: Linus Torvalds

context-tracking: Introduce CONFIG_HAVE_TIF_NOHZ

2020-02-14T15:05:04+00:00

A few archs (x86, arm, arm64) don't rely anymore on TIF_NOHZ to call into context tracking on user entry/exit but instead use static keys (or not) to optimize those calls. Ideally every arch should migrate to that behaviour in the long run. Settle a config option to let those archs remove their TIF_NOHZ definitions. Signed-off-by: Frederic Weisbecker Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Borislav Petkov Cc: Andy Lutomirski Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon Cc: Ralf Baechle Cc: Paul Burton Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: David S. Miller

asm-generic/tlb: provide MMU_GATHER_TABLE_FREE

2020-02-04T03:05:26+00:00

As described in the comment, the correct order for freeing pages is: 1) unhook page 2) TLB invalidate page 3) free page This order equally applies to page directories. Currently there are two correct options: - use tlb_remove_page(), when all page directores are full pages and there are no futher contraints placed by things like software walkers (HAVE_FAST_GUP). - use MMU_GATHER_RCU_TABLE_FREE and tlb_remove_table() when the architecture does not do IPI based TLB invalidate and has HAVE_FAST_GUP (or software TLB fill). This however leaves architectures that don't have page based directories but don't need RCU in a bind. For those, provide MMU_GATHER_TABLE_FREE, which provides the independent batching for directories without the additional RCU freeing. Link: http://lkml.kernel.org/r/20200116064531.483522-10-aneesh.kumar@linux.ibm.com Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Aneesh Kumar K.V Cc: Michael Ellerman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

asm-generic/tlb: rename HAVE_MMU_GATHER_NO_GATHER

2020-02-04T03:05:26+00:00

Towards a more consistent naming scheme. Link: http://lkml.kernel.org/r/20200116064531.483522-9-aneesh.kumar@linux.ibm.com Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Aneesh Kumar K.V Cc: Michael Ellerman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

asm-generic/tlb: rename HAVE_MMU_GATHER_PAGE_SIZE

2020-02-04T03:05:26+00:00

Towards a more consistent naming scheme. Link: http://lkml.kernel.org/r/20200116064531.483522-8-aneesh.kumar@linux.ibm.com Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Aneesh Kumar K.V Cc: Michael Ellerman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds