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Subject[PATCH 1/3] Revert "kbuild: give the SUBLEVEL more room in KERNEL_VERSION"
Date
This reverts commit 537896fabed11f8d9788886d1aacdb977213c7b3.

This turns out to be a bad idea: userspace has coded the structure of
KERNEL_VERSION on it's own and assumes the 2-1-1 byte split, making it
userspace ABI we can't break.

The reverted patch didn't make it past linux-next, so no userspace was
hurt in the process.

Signed-off-by: Sasha Levin <sashal@kernel.org>
---
Makefile | 7 ++-----
drivers/net/ethernet/mellanox/mlx5/core/main.c | 4 ++--
drivers/usb/core/hcd.c | 4 ++--
drivers/usb/gadget/udc/aspeed-vhub/hub.c | 4 ++--
include/linux/usb/composite.h | 4 ++--
kernel/sys.c | 2 +-
tools/perf/tests/bpf-script-example.c | 2 +-
tools/perf/tests/bpf-script-test-kbuild.c | 2 +-
tools/perf/tests/bpf-script-test-prologue.c | 2 +-
9 files changed, 14 insertions(+), 17 deletions(-)

diff --git a/Makefile b/Makefile
index 28019532e55ac..49ac1b7fe8e99 100644
--- a/Makefile
+++ b/Makefile
@@ -1259,11 +1259,8 @@ endef

define filechk_version.h
echo \#define LINUX_VERSION_CODE $(shell \
- expr $(VERSION) \* 16777216 + 0$(PATCHLEVEL) \* 65536 + 0$(SUBLEVEL)); \
- echo \#define LINUX_VERSION_MAJOR $(VERSION); \
- echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
- echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL); \
- echo '#define KERNEL_VERSION(a,b,c) (((a) << 24) + ((b) << 16) + (c))'
+ expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
+ echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
endef

$(version_h): FORCE
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 989f15d9aa7d4..e4c9627485aa5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -237,8 +237,8 @@ static void mlx5_set_driver_version(struct mlx5_core_dev *dev)
remaining_size = max_t(int, 0, driver_ver_sz - strlen(string));

snprintf(string + strlen(string), remaining_size, "%u.%u.%u",
- (u8)(LINUX_VERSION_MAJOR), (u8)(LINUX_VERSION_PATCHLEVEL),
- (u16)(LINUX_VERSION_SUBLEVEL));
+ (u8)((LINUX_VERSION_CODE >> 16) & 0xff), (u8)((LINUX_VERSION_CODE >> 8) & 0xff),
+ (u16)(LINUX_VERSION_CODE & 0xffff));

/*Send the command*/
MLX5_SET(set_driver_version_in, in, opcode,
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 3f0381344221e..ad5a0f405a75c 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -111,8 +111,8 @@ DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
*/

/*-------------------------------------------------------------------------*/
-#define KERNEL_REL bin2bcd(LINUX_VERSION_MAJOR)
-#define KERNEL_VER bin2bcd(LINUX_VERSION_PATCHLEVEL)
+#define KERNEL_REL bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
+#define KERNEL_VER bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))

/* usb 3.1 root hub device descriptor */
static const u8 usb31_rh_dev_descriptor[18] = {
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/hub.c b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
index 5c7dea5e0ff16..bfd8e77788e29 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
@@ -46,8 +46,8 @@
* - Make vid/did overridable
* - make it look like usb1 if usb1 mode forced
*/
-#define KERNEL_REL bin2bcd(LINUX_VERSION_MAJOR)
-#define KERNEL_VER bin2bcd(LINUX_VERSION_PATCHLEVEL)
+#define KERNEL_REL bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff))
+#define KERNEL_VER bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff))

enum {
AST_VHUB_STR_INDEX_MAX = 4,
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index c71150f2c6390..5646dad886e61 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -575,8 +575,8 @@ static inline u16 get_default_bcdDevice(void)
{
u16 bcdDevice;

- bcdDevice = bin2bcd(LINUX_VERSION_MAJOR) << 8;
- bcdDevice |= bin2bcd(LINUX_VERSION_PATCHLEVEL);
+ bcdDevice = bin2bcd((LINUX_VERSION_CODE >> 16 & 0xff)) << 8;
+ bcdDevice |= bin2bcd((LINUX_VERSION_CODE >> 8 & 0xff));
return bcdDevice;
}

diff --git a/kernel/sys.c b/kernel/sys.c
index b09fe21e88ff5..8bb46e50f02d4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1242,7 +1242,7 @@ static int override_release(char __user *release, size_t len)
break;
rest++;
}
- v = LINUX_VERSION_PATCHLEVEL + 60;
+ v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60;
copy = clamp_t(size_t, len, 1, sizeof(buf));
copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
ret = copy_to_user(release, buf, copy + 1);
diff --git a/tools/perf/tests/bpf-script-example.c b/tools/perf/tests/bpf-script-example.c
index a56bf381335e9..ab4b98b3165db 100644
--- a/tools/perf/tests/bpf-script-example.c
+++ b/tools/perf/tests/bpf-script-example.c
@@ -5,7 +5,7 @@
*/
#ifndef LINUX_VERSION_CODE
# error Need LINUX_VERSION_CODE
-# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x4020000" into llvm section of ~/.perfconfig'
+# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
#endif
#define BPF_ANY 0
#define BPF_MAP_TYPE_ARRAY 2
diff --git a/tools/perf/tests/bpf-script-test-kbuild.c b/tools/perf/tests/bpf-script-test-kbuild.c
index 21663295d5b5a..219673aa278fb 100644
--- a/tools/perf/tests/bpf-script-test-kbuild.c
+++ b/tools/perf/tests/bpf-script-test-kbuild.c
@@ -5,7 +5,7 @@
*/
#ifndef LINUX_VERSION_CODE
# error Need LINUX_VERSION_CODE
-# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x4020000" into llvm section of ~/.perfconfig'
+# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
#endif
#define SEC(NAME) __attribute__((section(NAME), used))

diff --git a/tools/perf/tests/bpf-script-test-prologue.c b/tools/perf/tests/bpf-script-test-prologue.c
index 8db19e70813cc..bd83d364cf30d 100644
--- a/tools/perf/tests/bpf-script-test-prologue.c
+++ b/tools/perf/tests/bpf-script-test-prologue.c
@@ -5,7 +5,7 @@
*/
#ifndef LINUX_VERSION_CODE
# error Need LINUX_VERSION_CODE
-# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x4020000" into llvm section of ~/.perfconfig'
+# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
#endif
#define SEC(NAME) __attribute__((section(NAME), used))

--
2.27.0
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