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Date: Wed, 1 Nov 2017 10:12:41 +0000 From: Suzuki K Poulose <Suzuki.Poulose@....com> To: Julien Thierry <julien.thierry@....com>, linux-arm-kernel@...ts.infradead.org Cc: linux-kernel@...r.kernel.org, robert.walker@....com, mike.leach@...aro.org, coresight@...ts.linaro.org, mathieu.poirier@...aro.org Subject: Re: [PATCH 06/17] coresight: tmc: Make ETR SG table circular On 20/10/17 18:11, Julien Thierry wrote: >> +static int __maybe_unused >> +tmc_etr_sg_table_rotate(struct etr_sg_table *etr_table, u64 base_offset) >> +{ >> + u32 last_entry, first_entry; >> + u64 last_offset; >> + struct tmc_sg_table *sg_table = etr_table->sg_table; >> + sgte_t *table_ptr = sg_table->table_vaddr; >> + ssize_t buf_size = tmc_sg_table_buf_size(sg_table); >> + >> + /* Offset should always be SG PAGE_SIZE aligned */ >> + if (base_offset & (ETR_SG_PAGE_SIZE - 1)) { >> + pr_debug("unaligned base offset %llx\n", base_offset); >> + return -EINVAL; >> + } >> + /* Make sure the offset is within the range */ >> + if (base_offset < 0 || base_offset > buf_size) { > > base_offset is unsigned, so the left operand of the '||' is useless (would've expected the compiler to emit a warning for this). > >> + base_offset = (base_offset + buf_size) % buf_size; >> + pr_debug("Resetting offset to %llx\n", base_offset); >> + } >> + first_entry = tmc_etr_sg_offset_to_table_index(base_offset); >> + if (first_entry == etr_table->first_entry) { >> + pr_debug("Head is already at %llx, skipping\n", base_offset); >> + return 0; >> + } >> + >> + /* Last entry should be the previous one to the new "base" */ >> + last_offset = ((base_offset - ETR_SG_PAGE_SIZE) + buf_size) % buf_size; >> + last_entry = tmc_etr_sg_offset_to_table_index(last_offset); >> + >> + /* Reset the current Last page to Normal and new Last page to NORMAL */ > > Current Last page to NORMAL and new Last page to LAST? Thanks again, will fix them Cheers Suzuki
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