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toolchain: allow using custom headers newer than latest known ones

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When Buildroot is released, it knows up to a certain kernel header
version, and no later. However, it is possible that an external
toolchain will be used, that uses headers newer than the latest version
Buildroot knows about.

This may also happen when testing a development, an rc-class, or a newly
released kernel, either in an external toolchain, or with an internal
toolchain with custom headers (same-as-kernel, custom version, custom
git, custom tarball).

In the current state, Buildroot would refuse to use such toolchains,
because the test is for strict equality.

We'd like to make that situation possible, but we also want the user not
to be lenient at the same time, and select the right headers version
when it is known.

So, we add a new Kconfig blind option that the latest kernel headers
version selects. This options is then used to decide whether we do a
strict or loose check of the kernel headers.

Suggested-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Vincent Fazio <vfazio@xes-inc.com>
[yann.morin.1998@free.fr:
  - only do a loose check for the latest version
  - expand commit log
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Tested-by: Vincent Fazio <vfazio@xes-inc.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Vincent Fazio
2020-01-15 19:29:07 +01:00
committed by Peter Korsgaard
parent fbe18eb246
commit 338e62bd5d
7 changed files with 51 additions and 9 deletions
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28
support/scripts/check-kernel-headers.sh
View File

@@ -1,9 +1,25 @@
#!/bin/sh
# This script (and the embedded C code) will check that the actual
# headers version match the user told us they were:
#
# - if both versions are the same, all is well.
#
# - if the actual headers are older than the user told us, this is
# an error.
#
# - if the actual headers are more recent than the user told us, and
# we are doing a strict check, then this is an error.
#
# - if the actual headers are more recent than the user told us, and
# we are doing a loose check, then a warning is printed, but this is
# not an error.
BUILDDIR="${1}"
SYSROOT="${2}"
# Make sure we have enough version components
HDR_VER="${3}.0.0"
CHECK="${4}" # 'strict' or 'loose'
HDR_M="${HDR_VER%%.*}"
HDR_V="${HDR_VER#*.}"
@@ -28,20 +44,24 @@ ${HOSTCC} -imacros "${SYSROOT}/usr/include/linux/version.h" \
-x c -o "${EXEC}" - <<_EOF_
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc __attribute__((unused)),
char** argv __attribute__((unused)))
{
if((LINUX_VERSION_CODE & ~0xFF)
!= KERNEL_VERSION(${HDR_M},${HDR_m},0))
int ret = 0;
int l = LINUX_VERSION_CODE & ~0xFF;
int h = KERNEL_VERSION(${HDR_M},${HDR_m},0);
if(l != h)
{
printf("Incorrect selection of kernel headers: ");
printf("expected %d.%d.x, got %d.%d.x\n", ${HDR_M}, ${HDR_m},
((LINUX_VERSION_CODE>>16) & 0xFF),
((LINUX_VERSION_CODE>>8) & 0xFF));
return 1;
ret = ((l >= h) && !strcmp("${CHECK}", "loose")) ? 0 : 1;
}
return 0;
return ret;
}
_EOF_