diff options
| author | Thomas Huth <thuth@redhat.com> | 2021-04-23 10:30:51 +0200 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2021-05-09 18:14:31 +0200 |
| commit | ff77712a8a2e15e5901fad35b9a6bb65974b2e4a (patch) | |
| tree | 354bc09d5e16179ee9b672a79b0e333a31cef4b7 /pc-bios/s390-ccw | |
| parent | d08a64940452060ab7ad5eb49cd5801131c2b9ec (diff) | |
pc-bios/s390-ccw: Use reset_psw pointer instead of hard-coded null pointer
When compiling the s390-ccw bios with clang, it emits a warning like this:
pc-bios/s390-ccw/jump2ipl.c:86:9: warning: indirection of non-volatile null
pointer will be deleted, not trap [-Wnull-dereference]
if (*((uint64_t *)0) & RESET_PSW_MASK) {
^~~~~~~~~~~~~~~~
pc-bios/s390-ccw/jump2ipl.c:86:9: note: consider using __builtin_trap() or
qualifying pointer with 'volatile'
We could add a "volatile" here to shut it up, but on the other hand,
we also have a pointer variable called "reset_psw" in this file already
that points to the PSW at address 0, so we can simply use that pointer
variable instead.
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210423142440.582188-1-thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'pc-bios/s390-ccw')
| -rw-r--r-- | pc-bios/s390-ccw/jump2ipl.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c index b9c70d64a5..73e4367e09 100644 --- a/pc-bios/s390-ccw/jump2ipl.c +++ b/pc-bios/s390-ccw/jump2ipl.c @@ -82,8 +82,8 @@ void jump_to_low_kernel(void) jump_to_IPL_code(KERN_IMAGE_START); } - /* Trying to get PSW at zero address */ - if (*((uint64_t *)0) & RESET_PSW_MASK) { + /* Trying to get PSW at zero address (pointed to by reset_psw) */ + if (*reset_psw & RESET_PSW_MASK) { /* * Surely nobody will try running directly from lowcore, so * let's use 0 as an indication that we want to load the reset |