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From: Michael Ellerman <mpe@ellerman.id.au>
To: Sandipan Das <sandipan@linux.ibm.com>,
	shuahkh@osg.samsung.com, linux-kselftest@vger.kernel.org
Cc: linux-arch@vger.kernel.org, fweimer@redhat.com,
	linux-mm@kvack.org, aneesh.kumar@linux.ibm.com, x86@kernel.org,
	linuxram@us.ibm.com, mhocko@kernel.org, dave.hansen@intel.com,
	mingo@redhat.com, msuchanek@suse.de,
	linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com
Subject: Re: [PATCH v15 23/23] selftests: vm: pkeys: Use the correct page size on powerpc
Date: Wed, 15 Jan 2020 17:07:36 +1000	[thread overview]
Message-ID: <87h80x9ozr.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <ff7c288e2a88ccfb3b79be30967646fe5b869683.1576645161.git.sandipan@linux.ibm.com>

Sandipan Das <sandipan@linux.ibm.com> writes:
> Both 4K and 64K pages are supported on powerpc. Parts of
> the selftest code perform alignment computations based on
> the PAGE_SIZE macro which is currently hardcoded to 64K
> for powerpc. This causes some test failures on kernels
> configured with 4K page size.
>
> This problem is solved by determining the correct page
> size during the build process rather than hardcoding it
> in the header file.

Doing it at build time is wrong, the test could be built on a 4K system
and then run on a 64K system, or vice versa.

You should just use getpagesize() at runtime.

cheers

> diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
> index 4e9c741be6af..ada3a67eaac6 100644
> --- a/tools/testing/selftests/vm/Makefile
> +++ b/tools/testing/selftests/vm/Makefile
> @@ -4,6 +4,10 @@ uname_M := $(shell uname -m 2>/dev/null || echo not)
>  ARCH ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/')
>  
>  CFLAGS = -Wall -I ../../../../usr/include $(EXTRA_CFLAGS)
> +ifneq (,$(filter $(ARCH), ppc64 ppc64le))
> +protection_keys: EXTRA_CFLAGS += -DPAGE_SIZE=$(shell getconf PAGESIZE)
> +endif
> +
>  LDLIBS = -lrt
>  TEST_GEN_FILES = compaction_test
>  TEST_GEN_FILES += gup_benchmark
> diff --git a/tools/testing/selftests/vm/pkey-powerpc.h b/tools/testing/selftests/vm/pkey-powerpc.h
> index 3cd8e03fd640..07fa9f529014 100644
> --- a/tools/testing/selftests/vm/pkey-powerpc.h
> +++ b/tools/testing/selftests/vm/pkey-powerpc.h
> @@ -36,7 +36,6 @@
>  					     pkey-31 and exec-only key */
>  #define PKEY_BITS_PER_PKEY	2
>  #define HPAGE_SIZE		(1UL << 24)
> -#define PAGE_SIZE		(1UL << 16)
>  #define pkey_reg_t		u64
>  #define PKEY_REG_FMT		"%016lx"
>  
> -- 
> 2.17.1

  reply	other threads:[~2020-01-15  7:07 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-18  7:51 [PATCH v15 00/24] selftests, powerpc, x86: Memory Protection Keys Sandipan Das
2019-12-18  7:51 ` [PATCH v15 01/23] selftests/x86/pkeys: Move selftests to arch-neutral directory Sandipan Das
2019-12-18  7:51 ` [PATCH v15 02/23] selftests/vm/pkeys: Rename all references to pkru to a generic name Sandipan Das
2019-12-18  7:51 ` [PATCH v15 03/23] selftests/vm/pkeys: Move generic definitions to header file Sandipan Das
2019-12-18  7:51 ` [PATCH v15 04/23] selftests/vm/pkeys: Move some definitions to arch-specific header Sandipan Das
2019-12-18  7:51 ` [PATCH v15 05/23] selftests/vm/pkeys: Make gcc check arguments of sigsafe_printf() Sandipan Das
2019-12-18  7:51 ` [PATCH v15 06/23] selftests/vm/pkeys: Typecast the pkey register Sandipan Das
2019-12-18 20:46   ` Dave Hansen
2019-12-18 20:59     ` Michal Suchánek
2019-12-18 21:01       ` Dave Hansen
2019-12-18 21:45         ` Michal Suchánek
2019-12-19 11:39         ` Michael Ellerman
2019-12-18  7:51 ` [PATCH v15 07/23] selftests: vm: pkeys: Add helpers for pkey bits Sandipan Das
2019-12-18  7:51 ` [PATCH v15 08/23] selftests/vm/pkeys: Fix pkey_disable_clear() Sandipan Das
2019-12-18  7:51 ` [PATCH v15 09/23] selftests/vm/pkeys: Fix assertion in pkey_disable_set/clear() Sandipan Das
2019-12-18  7:51 ` [PATCH v15 10/23] selftests/vm/pkeys: Fix alloc_random_pkey() to make it really random Sandipan Das
2019-12-18  7:51 ` [PATCH v15 11/23] selftests: vm: pkeys: Use the correct huge page size Sandipan Das
2019-12-18  7:51 ` [PATCH v15 12/23] selftests/vm/pkeys: Introduce generic pkey abstractions Sandipan Das
2019-12-18  7:51 ` [PATCH v15 13/23] selftests/vm/pkeys: Introduce powerpc support Sandipan Das
2019-12-18  7:51 ` [PATCH v15 14/23] selftests/vm/pkeys: Fix assertion in test_pkey_alloc_exhaust() Sandipan Das
2020-01-15  7:30   ` Michael Ellerman
2019-12-18  7:51 ` [PATCH v15 15/23] selftests/vm/pkeys: Improve checks to determine pkey support Sandipan Das
2019-12-18  7:51 ` [PATCH v15 16/23] selftests/vm/pkeys: Associate key on a mapped page and detect access violation Sandipan Das
2019-12-18  7:51 ` [PATCH v15 17/23] selftests/vm/pkeys: Associate key on a mapped page and detect write violation Sandipan Das
2019-12-18  7:51 ` [PATCH v15 18/23] selftests/vm/pkeys: Detect write violation on a mapped access-denied-key page Sandipan Das
2019-12-18  7:51 ` [PATCH v15 19/23] selftests/vm/pkeys: Introduce a sub-page allocator Sandipan Das
2019-12-18  7:51 ` [PATCH v15 20/23] selftests/vm/pkeys: Test correct behaviour of pkey-0 Sandipan Das
2019-12-18  7:51 ` [PATCH v15 21/23] selftests/vm/pkeys: Fix number of reserved powerpc pkeys Sandipan Das
2019-12-18  7:51 ` [PATCH v15 22/23] selftests/vm/pkeys: Override access right definitions on powerpc Sandipan Das
2019-12-18  7:51 ` [PATCH v15 23/23] selftests: vm: pkeys: Use the correct page size " Sandipan Das
2020-01-15  7:07   ` Michael Ellerman [this message]
2020-01-16  8:33     ` Sandipan Das
2019-12-18 20:48 ` [PATCH v15 00/24] selftests, powerpc, x86: Memory Protection Keys Dave Hansen
2020-01-10 17:38 ` Aneesh Kumar K.V
2020-01-10 17:57   ` Dave Hansen
2020-01-11 16:50     ` Sandipan Das

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