anchao opened a new pull request, #14510:
URL: https://github.com/apache/nuttx/pull/14510
## Summary
driver/serial: remove return value of up_putc()
modify the prototype of up_putc(): remove the return value
The architecture code does not care about the return value of up_putc(), so
removing it saves two statements:
```
Before: After:
de4c: e52de004 push {lr} @ (str lr, [sp, #-4]!) | de4c: e52de004
push {lr} @ (str lr, [sp, #-4]!)
de50: e24dd014 sub sp, sp, #20 | de50: e24dd014
sub sp, sp, #20
de54: e58d0004 str r0, [sp, #4] | de54: e58d0004
str r0, [sp, #4]
de58: e30030f8 movw r3, #248 @ 0xf8 | de58: e30030f8
movw r3, #248 @ 0xf8
de5c: e3423000 movt r3, #8192 @ 0x2000 | de5c: e3423000
movt r3, #8192 @ 0x2000
de60: e58d300c str r3, [sp, #12] | de60: e58d300c
str r3, [sp, #12]
de64: e59d1004 ldr r1, [sp, #4] | de64: e59d1004
ldr r1, [sp, #4]
de68: e59d000c ldr r0, [sp, #12] | de68: e59d000c
ldr r0, [sp, #12]
de6c: ebfffe66 bl d80c <pl011_putc> | de6c: ebfffe66
bl d80c <pl011_putc>
de70: e59d3004 ldr r3, [sp, #4] | de70: e28dd014
add sp, sp, #20
de74: e1a00003 mov r0, r3 | de74: e49df004
pop {pc} @ (ldr pc, [sp], #4)
de78: e28dd014 add sp, sp, #20 |
de7c: e49df004 pop {pc} @ (ldr pc, [sp], #4) |
```
Signed-off-by: chao an <[email protected]>
## Impact
N/A
## Testing
ci-check
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