On Thu, Feb 22, 2018 at 12:47:05PM +0100, Arnd Bergmann wrote:
> On linux-next, I get a build failure in some configurations:
> 
> drivers/perf/arm_spe_pmu.c: In function 'arm_spe_pmu_setup_aux':
> drivers/perf/arm_spe_pmu.c:857:14: error: implicit declaration of function 
> 'vmap'; did you mean 'swap'? [-Werror=implicit-function-declaration]
>   buf->base = vmap(pglist, nr_pages, VM_MAP, PAGE_KERNEL);
>               ^~~~
>               swap
> drivers/perf/arm_spe_pmu.c:857:37: error: 'VM_MAP' undeclared (first use in 
> this function); did you mean 'VM_MPX'?
>   buf->base = vmap(pglist, nr_pages, VM_MAP, PAGE_KERNEL);
>                                      ^~~~~~
>                                      VM_MPX
> drivers/perf/arm_spe_pmu.c:857:37: note: each undeclared identifier is 
> reported only once for each function it appears in
> drivers/perf/arm_spe_pmu.c: In function 'arm_spe_pmu_free_aux':
> drivers/perf/arm_spe_pmu.c:878:2: error: implicit declaration of function 
> 'vunmap'; did you mean 'iounmap'? [-Werror=implicit-function-declaration]
> 
> vmap() is declared in linux/vmalloc.h, so we should include that header file.
> 
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> ---
> I have not bisected what caused this problem, presumably some other
> header stopped including vmlinux.h.
> ---
>  drivers/perf/arm_spe_pmu.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
> index 51b40aecb776..f90672516ada 100644
> --- a/drivers/perf/arm_spe_pmu.c
> +++ b/drivers/perf/arm_spe_pmu.c
> @@ -32,6 +32,7 @@
>  #include <linux/perf_event.h>
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
> +#include <linux/vmalloc.h>

This looks good. From a quick look, we're also missing explicit includes
for:

#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/capability.h>
#include <linux/cpumask.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/printk.h>
#include <linux/smp.h>

#include <asm/barrier.h>
#include <asm/cpufeature.h>
#include <asm/mmu.h>

... which would be worth sorting out at teh same time.

Will, are you happy to fold those in? Assuming so:

Acked-by: Mark Rutland <mark.rutl...@arm.com>

Mark.

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