linux-kernel - [PATCH 3/4] random: vDSO: Clean header inclusion in getrandom

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Message-ID: <8a025e72484467cd34412b20e8638a5982c1867e.1724743492.git.christophe.leroy@csgroup.eu>
Date: Tue, 27 Aug 2024 09:31:49 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: "Theodore Ts'o" <tytso@....edu>,
	"Jason A. Donenfeld" <Jason@...c4.com>,
	Arnd Bergmann <arnd@...db.de>,
	Andy Lutomirski <luto@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-arch@...r.kernel.org
Subject: [PATCH 3/4] random: vDSO: Clean header inclusion in getrandom

Building a VDSO32 on a 64 bits kernel is problematic when some
system headers are included. See commit 8c59ab839f52 ("lib/vdso:
Enable common headers") for more details.

Minimise the amount of headers by moving needed items into
dedicated common headers.

Removing linux/time64.h leads to missing 'struct timespec64' in
x86's asm/pvclock.h. Add a forward declaration of that struct in
that file.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v3: Split PAGE_SIZE/PAGE_MASK subject in another patch and explained the forward declaration of 'struct timespec64' in commit message.
---
 arch/x86/include/asm/pvclock.h | 1 +
 include/vdso/helpers.h         | 1 +
 lib/vdso/getrandom.c           | 8 +++-----
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h
index 0c92db84469d..6e4f8fae3ce9 100644
--- a/arch/x86/include/asm/pvclock.h
+++ b/arch/x86/include/asm/pvclock.h
@@ -5,6 +5,7 @@
 #include <asm/clocksource.h>
 #include <asm/pvclock-abi.h>
 
+struct timespec64;
 /* some helper functions for xen and kvm pv clock sources */
 u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);
 u64 pvclock_clocksource_read_nowd(struct pvclock_vcpu_time_info *src);
diff --git a/include/vdso/helpers.h b/include/vdso/helpers.h
index 73501149439d..3ddb03bb05cb 100644
--- a/include/vdso/helpers.h
+++ b/include/vdso/helpers.h
@@ -4,6 +4,7 @@
 
 #ifndef __ASSEMBLY__
 
+#include <asm/barrier.h>
 #include <vdso/datapage.h>
 
 static __always_inline u32 vdso_read_begin(const struct vdso_data *vd)
diff --git a/lib/vdso/getrandom.c b/lib/vdso/getrandom.c
index 5874e3072bfe..5d79663b026b 100644
--- a/lib/vdso/getrandom.c
+++ b/lib/vdso/getrandom.c
@@ -4,15 +4,13 @@
  */
 
 #include <linux/array_size.h>
-#include <linux/cache.h>
-#include <linux/kernel.h>
-#include <linux/time64.h>
+#include <linux/minmax.h>
 #include <vdso/datapage.h>
 #include <vdso/getrandom.h>
+#include <vdso/unaligned.h>
 #include <asm/vdso/getrandom.h>
-#include <asm/vdso/vsyscall.h>
-#include <asm/unaligned.h>
 #include <uapi/linux/mman.h>
+#include <uapi/linux/random.h>
 
 #define MEMCPY_AND_ZERO_SRC(type, dst, src, len) do {				\
 	while (len >= sizeof(type)) {						\
-- 
2.44.0