On 9/18/21 3:35 PM, Dongliang Mu wrote:
Hello everyone,
I encounter one object with __uint128_t type in the following code.
But I am not sure how to print the content of __uint128_t.
struct user_fpsimd_state {
__uint128_t vregs[32];
__u32 fpsr;
__u32 fpcr;
__u32 __reserved[2];
};
At first, I would like to use:
pr_alert("0x%lx %lx\n", i, (uint64_t)(fpreg.vregs[i] >> 64),
(uint64_t)(fpreg.vregs[i]));
However, gcc reports error with "-Werror" enabled:
In function ‘print_fpregs_in_coredump’:
error: iteration 32 invokes undefined behavior
[-Werror=aggressive-loop-optimizations]
89 | pr_alert("V%d 0x%lx %lx\n", i, (uint64_t)(fpreg.vregs[i] >> 64),
Any idea to eliminate this error?
--
My best regards to you.
No System Is Safe!
Dongliang Mu
Hi
I do like this example:
https://lwn.net/Articles/745261/
...
pr_err("%llx%llx\n", (u64) (val >> 64), (u64) val);
pr_err("%llx%llx\n", (u64) (v >> 64), (u64) v);
...
But I have not tried it.
Bye Philipp
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