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    Subject[PATCH] arch/um: Add a dummy cacheflush.h header
    Date
    From: Borislav Petkov <bp@suse.de>

    ... in order to fix the defconfig build:

    ./arch/x86/include/asm/cacheflush.h: In function ‘l1d_flush_hw’:
    ./arch/x86/include/asm/cacheflush.h:15:6: error: implicit declaration of \
    function ‘static_cpu_has’; did you mean ‘static_key_false’? [-Werror=implicit-function-declaration]
    15 | if (static_cpu_has(X86_FEATURE_FLUSH_L1D)) {
    | ^~~~~~~~~~~~~~
    | static_key_false
    cc1: some warnings being treated as errors
    ./arch/x86/include/asm/cacheflush.h:16:3: error: implicit declaration of \
    function ‘wrmsrl’ [-Werror=implicit-function-declaration]
    16 | wrmsrl(MSR_IA32_FLUSH_CMD, L1D_FLUSH);
    |

    Fixes: a9210620ec36 ("x86/mm: Optionally flush L1D on context switch")
    Reported-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Borislav Petkov <bp@suse.de>
    Cc: Richard Weinberger <richard@nod.at>
    Cc: Balbir Singh <sblbir@amazon.com>
    ---
    arch/um/include/asm/cacheflush.h | 9 +++++++++
    1 file changed, 9 insertions(+)
    create mode 100644 arch/um/include/asm/cacheflush.h

    diff --git a/arch/um/include/asm/cacheflush.h b/arch/um/include/asm/cacheflush.h
    new file mode 100644
    index 000000000000..b9dee9760043
    --- /dev/null
    +++ b/arch/um/include/asm/cacheflush.h
    @@ -0,0 +1,9 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +#ifndef _ASM_UML_CACHEFLUSH_H
    +#define _ASM_UML_CACHEFLUSH_H
    +
    +#undef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
    +#include <asm-generic/cacheflush.h>
    +
    +static inline int l1d_flush_hw(void) { return -EOPNOTSUPP; }
    +#endif /* _ASM_UML_CACHEFLUSH_H */
    --
    2.21.0
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