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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-kselftest@vger.kernel.org, linux-um@lists.infradead.org Subject: Re: [RFC PATCH 4/6] selftests: fix build errors on alpine linux Message-ID: References: <20260813063401.1786548-1-thehajime@gmail.com> <20260813063401.1786548-5-thehajime@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260813063401.1786548-5-thehajime@gmail.com> X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; MISSING_XM_UA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_TWELVE(0.00)[15]; FREEMAIL_TO(0.00)[gmail.com]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,infradead.org:email,imap1.dmz-prg2.suse.org:helo] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260814_023435_768812_97079F25 X-CRM114-Status: GOOD ( 29.04 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org /me puts on his libc hat On Thu, Aug 13, 2026 at 03:33:59PM +0900, Hajime Tazaki wrote: > Some nommu architectures only work on Alpine Linux, which doesn't use > glibc for the standard library. It uses musl-libc and is implemented in > a different way as glibc, resulting build failures. > > This commit fixes this issue by adding missing definitions. The fixes > are now only covered to TARGETS=mm which was tested for the moment; > future contributions are needed to fully build/execute tests on nommu > platforms. > > Cc: Shuah Khan > Cc: Andrew Morton > Cc: David Hildenbrand > Cc: Lorenzo Stoakes > Cc: "Liam R. Howlett" > Cc: Vlastimil Babka > Cc: Mike Rapoport > Cc: Suren Baghdasaryan > Cc: Michal Hocko > Cc: linux-kselftest@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-um@lists.infradead.org > Signed-off-by: Hajime Tazaki > --- > tools/testing/selftests/kselftest.h | 43 ++++++++++++++++++++++++ > tools/testing/selftests/lib.mk | 2 +- > tools/testing/selftests/mm/hugetlb_dio.c | 8 ++--- > tools/testing/selftests/mm/mdwe_test.c | 4 +-- > 4 files changed, 50 insertions(+), 7 deletions(-) > > diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h > index ae18c491ae53..ac21bf3d802e 100644 > --- a/tools/testing/selftests/kselftest.h > +++ b/tools/testing/selftests/kselftest.h > @@ -58,6 +58,7 @@ > #include > #include > #include > +#include > #endif > > #ifndef ARRAY_SIZE > @@ -81,6 +82,48 @@ > #endif > #endif /* end arch */ > > +#if !defined(NOLIBC) && !defined(__GLIBC__) > +#ifdef __LP64__ > +typedef int64_t __fsword_t; > +#else > +typedef int32_t __fsword_t; > +#endif The code should not be using __fsword_t. Per statfs(2): The __fsword_t type used for various fields in the statfs structure definition is a glibc internal type, not intended for public use. This leaves the programmer in a bit of a conundrum when trying to copy or compare these fields to local variables in a program. Using unsigned int for such variables suffices on most systems. and indeed if you look at musl's statvfs definition: struct statvfs { /* ... */ unsigned int f_type; /* ... */ }; so it should be perfectly cromulent to use unsigned int here. Or use an actual usable interface :) > + > +/* > + * for a workaround to avoid struct conflict under > + * musl-libc ( v.s. ) > + */ > +#include > +#ifndef _LINUX_PRCTL_H > +#define _LINUX_PRCTL_H > +#endif > + > +#ifndef PR_SET_MDWE > +#define PR_SET_MDWE 65 > +#endif > + > +#ifndef PR_MDWE_REFUSE_EXEC_GAIN > +#define PR_MDWE_REFUSE_EXEC_GAIN (1UL << 0) > +#endif > + > +#ifndef PR_MDWE_NO_INHERIT > +#define PR_MDWE_NO_INHERIT (1UL << 1) > +#endif > + > +#ifndef PR_GET_MDWE > +#define PR_GET_MDWE 66 > +#endif > + > +#ifndef PR_SET_MEMORY_MERGE > +#define PR_SET_MEMORY_MERGE 67 > +#endif > + > +#ifndef PR_GET_MEMORY_MERGE > +#define PR_GET_MEMORY_MERGE 68 > +#endif > + > +#endif This looks fine. It's the same old problem with musl and kernel headers. > + > /* define kselftest exit codes */ > #define KSFT_PASS 0 > #define KSFT_FAIL 1 > diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk > index f02cc8a2e4ae..2cc819006424 100644 > --- a/tools/testing/selftests/lib.mk > +++ b/tools/testing/selftests/lib.mk > @@ -197,7 +197,7 @@ clean: $(if $(TEST_GEN_MODS_DIR),clean_mods_dir) > $(CLEAN) > > # Build with _GNU_SOURCE by default > -CFLAGS += -D_GNU_SOURCE= > +CFLAGS += -D_GNU_SOURCE= -D_LARGEFILE64_SOURCE What needs this? > > # Additional include paths needed by kselftest.h and local headers > CFLAGS += -I${top_srcdir}/tools/testing/selftests > diff --git a/tools/testing/selftests/mm/hugetlb_dio.c b/tools/testing/selftests/mm/hugetlb_dio.c > index fb4600570e13..aee6be530ccb 100644 > --- a/tools/testing/selftests/mm/hugetlb_dio.c > +++ b/tools/testing/selftests/mm/hugetlb_dio.c > @@ -22,12 +22,9 @@ > #include "kselftest.h" > #include "hugepage_settings.h" > > -#ifndef STATX_DIOALIGN > -#define STATX_DIOALIGN 0x00002000U > -#endif Why doesn't this fallback work? > - > static int get_dio_alignment(int fd) > { > +#ifdef STATX_DIOALIGN > struct statx stx; > int ret; > > @@ -43,6 +40,9 @@ static int get_dio_alignment(int fd) > return 1; > > return stx.stx_dio_offset_align; > +#else > + return -1; > +#endif > } > > static bool check_dio_alignment(unsigned int start_off, > diff --git a/tools/testing/selftests/mm/mdwe_test.c b/tools/testing/selftests/mm/mdwe_test.c > index 647779653da0..031c79ed067e 100644 > --- a/tools/testing/selftests/mm/mdwe_test.c > +++ b/tools/testing/selftests/mm/mdwe_test.c > @@ -1,5 +1,7 @@ > // SPDX-License-Identifier: GPL-2.0 > > +#include "kselftest_harness.h" > + > #ifdef __aarch64__ > #include > #endif > @@ -14,8 +16,6 @@ > #include > #include > > -#include "kselftest_harness.h" > - > #ifndef __aarch64__ > # define PROT_BTI 0 > #endif > -- > 2.43.0 > > Honestly, I'm surprised you needed so few hacks for this! But if I am to guess, there are certainly much more problematic selftests out there. -- Pedro